package com.wxj.educenter.controller;

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import com.wxj.commonutils.util.JwtUtils;
import com.wxj.educenter.entity.UcenterMember;
import com.wxj.educenter.service.UcenterMemberService;
import com.wxj.educenter.utils.ConstantWxUtils;
import com.wxj.educenter.utils.HttpClientUtils;
import com.wxj.servicebase.exceptionHandler.BaseException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.net.URLEncoder;
import java.util.HashMap;

//@CrossOrigin
@Controller  //只是请求地址，不需要返回数据
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;


    //1 生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode() {
        //固定地址，后面拼接参数
//        String url = "https://open.weixin.qq.com/" +
//                "connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";

        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        } catch (Exception e) {
            throw new BaseException(20001, e.getMessage());
        }

        // 防止csrf攻击（跨站请求伪造攻击）
        //String state = UUID.randomUUID().toString().replaceAll("-", "");//一般情况下会使用一个随机数
        String state = "wxj";//为了让大家能够使用我搭建的外网的微信回调跳转服务器，这里填写你在ngrok的前置域名
        System.out.println("state = " + state);

        // 采用redis等进行缓存state 使用sessionId为key 30分钟后过期，可配置
        //键："wechar-open-state-" + httpServletRequest.getSession().getId()
        //值：satte
        //过期时间：30分钟

        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                state);

        //重定向到请求微信地址里面
        return "redirect:" + url;
    }


    //2 获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code, String state) {

        //得到授权临时票据code
        System.out.println(code);
        System.out.println(state);

        try {
            //1 获取code值，临时票据，类似于验证码
            //2 拿着code请求 微信固定的地址，得到两个值 accsess_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数 ：id 、 秘钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );

            //请求这个拼接好的地址，得到返回两个值 accsess_token 和 openid
            //使用httpclient发送请求，得到返回结果
            //String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            String result = null;
            try {
                result = HttpClientUtils.get(accessTokenUrl);
                System.out.println("accessToken=============" + result);
            } catch (Exception e) {
                throw new BaseException(20001, "获取access_token失败");
            }

            //从accessTokenInfo字符串获取出来两个值 accsess_token 和 openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            //使用json转换工具 Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(result, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");

            //把扫描人信息添加数据库里面
            //判断数据表里面是否存在相同微信信息，根据openid判断
            System.out.println("openId" + openid);
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null) {   //memeber是空，表没有相同微信数据，进行添加
                System.out.println("新用户注册");

                //3 拿着得到accsess_token 和 openid，再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String resultUserInfo = null;
                try {
                    resultUserInfo = HttpClientUtils.get(userInfoUrl);
                    System.out.println("resultUserInfo==========" + resultUserInfo);
                } catch (Exception e) {
                    throw new BaseException(20001, "获取用户信息失败");
                }

                //解析json
                String nickname = null;
                String headimgurl = null;
                Double sex = null;
                try {
                    HashMap<String, Object> mapUserInfo = gson.fromJson(resultUserInfo, HashMap.class);
                    System.out.println("用户信息：" + mapUserInfo);
                    nickname = (String) mapUserInfo.get("nickname");    //昵称
                    headimgurl = (String) mapUserInfo.get("headimgurl");    //头像
                    sex = (Double) mapUserInfo.get("sex");
                } catch (JsonSyntaxException e) {
                    throw new BaseException(20001, "系统参数转化异常");
                }

                member = new UcenterMember();
                System.out.println("openid" + openid);
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
//            System.out.println("输出：" + member);
                memberService.save(member);
//            System.out.println("输出：" + save);
            }

            // 生成jwt token
            String token = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            return "redirect:http://localhost:3000?token=" + token;
        } catch (Exception e) {
            throw new BaseException(20001, "登陆失败");
        }
    }


}
